Question

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PHP session side-effect warning with global variables as a source of data

I have a problem with a login script that im using. problem is with some of the hosting providers after login the session is not registering. and in php error logs i can see this error

PHP Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively in Unknown on line 0

but in most of the hosting’s like bluehost, hostmonster it works fine without any error. can someone point me out what is the wrong thing im doing here? thank you in advanced.

Code:

<?
session_start();
ob_start();
?>

        <?php
        $err=isset($_GET['error'])?$_GET['error']:""; 
        if($err=='error'){?>
        <div class="errormsgbox">Wrong Username or Password. Please try again.</div>    
        <?php }

        if(!isset($_SESSION['adminuser'])){
        if($_SERVER["REQUEST_METHOD"] == "POST")
        {
        // username and password sent from Form
        $adminuser=mysql_real_escape_string($_POST['adminuser']); 
        $adminpassword=mysql_real_escape_string($_POST['adminpassword']); 
        $gpassword=md5($adminpassword); // Encrypted Password
        $sql="SELECT id FROM admin WHERE adminuser='$adminuser' and adminpassword='$gpassword'";
        $result=mysql_query($sql);
        $count=mysql_num_rows($result);

        // If result matched $username and $password, table row must be 1 row
        if($count==1)
        {

        session_register("adminuser");

        header("location:index.php");
        }
        else
        {
        header("location:login.php?error=error");

        }
        }
        ob_end_flush();

        ?>
    <form action="login.php" method="post">
    <div class="login_input">
    <label class="loginlbl"  for="adminuser">UserName :</label>
    <input type="text" name="adminuser"/>
    </div>
    <div class="login_input">
    <label class="loginlbl"  for="adminpassword">Password :</label>
    <input type="password" name="adminpassword"/>
    </div>
    <div class="login_submit">
    <input type="submit" id="submit" value=" Login to Admin Contol Panel"/>
    </div>
    </form>
    <?php }else{
    header("location:index.php");
    }
    ?>

Answer 1

The use of session_register is deprecated as says in PHP:SESSION_REGISTER

You should use:

//session_register("adminuser"); //deprecated
$_SESSION["adminuser"] = $adminuser;